EP2172246A2 - Méthodes pour le traitement de la maladie d'Alzheimer et l'amélioration cognitive - Google Patents

Méthodes pour le traitement de la maladie d'Alzheimer et l'amélioration cognitive Download PDF

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EP2172246A2
EP2172246A2 EP10000734A EP10000734A EP2172246A2 EP 2172246 A2 EP2172246 A2 EP 2172246A2 EP 10000734 A EP10000734 A EP 10000734A EP 10000734 A EP10000734 A EP 10000734A EP 2172246 A2 EP2172246 A2 EP 2172246A2
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bryostatin
pkc
disease
alzheimer
compounds
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Daniel L. Alkon
Rene Etcheberrigaray
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Blanchette Rockefeller Neuroscience Institute
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    • A61K31/00—Medicinal preparations containing organic active ingredients
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    • A61K31/365—Lactones
    • A—HUMAN NECESSITIES
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    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/335—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin
    • A61K31/365—Lactones
    • A61K31/366—Lactones having six-membered rings, e.g. delta-lactones
    • A—HUMAN NECESSITIES
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    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/08—Antiepileptics; Anticonvulsants
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    • A61P25/00—Drugs for disorders of the nervous system
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    • A—HUMAN NECESSITIES
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    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/14—Drugs for disorders of the nervous system for treating abnormal movements, e.g. chorea, dyskinesia
    • A61P25/16—Anti-Parkinson drugs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/28—Drugs for disorders of the nervous system for treating neurodegenerative disorders of the central nervous system, e.g. nootropic agents, cognition enhancers, drugs for treating Alzheimer's disease or other forms of dementia
    • A—HUMAN NECESSITIES
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    • A61P3/02—Nutrients, e.g. vitamins, minerals
    • A—HUMAN NECESSITIES
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    • A—HUMAN NECESSITIES
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Definitions

  • the present invention relates to the modulation of ⁇ -secretase and cognitive enhancement.
  • the invention further relates to compounds for treatment of conditions associated with amyloid processing such as Alzheimer's Disease and compositions for the treatment of such conditions.
  • ADHD Attention Deficit Hyperactivity Disorder
  • Other conditions include general dementias associated with other neurological diseases, aging, and treatment of conditions that can cause deleterious effects on mental capacity, such as cancer treatments, stroke/ischemia, and mental retardation.
  • cognition enhancers or activators that have been developed are generally classified to include nootropics, vasodilators, metabolic enhancers, psychostimulants, cholinergic agents, biogenic amine drugs, and neuropeptides.
  • Vasodilators and metabolic enhancers e.g. dihydroergotoxine
  • cognition enhancers typically only metabolic drugs are employed for clinical use, as others are still in the investigation stage.
  • piracetam activates the peripheral endocrine system, which is not appropriate for Alzheimer's disease due to the high concentration of steroids produced in patients while tacrine, a cholinergic agent, has a variety of side effects including vomiting, diarrhea, and hepatotoxicity.
  • Alzheimer's Disease is typically associated with the formation of plaques through the accumulation of amyloid precursor protein. Attempts to illicit an immunological response through treatment against amyloid and plaque formation have been done in animal models, but have not been successfully extended to humans.
  • cholinesterase inhibitors only produce some symptomatic improvement for a short time and in only a fraction of the Alzheimer's Disease patients with mid to moderate symptoms and are thus only a useful treatment for a small portion of the overall patient population. Even more critical is that present efforts at improving cognition do not result in treatment of the disease condition, but are merely ameliorative of the symptoms. Current treatments do not modify the disease progression. These treatments have also include the use of a "vaccine" to treat the symptoms of Alzheimer's Disease patients which, while the theoretically plausible and effective in mice tests, have been shown to cause severe adverse reactions in humans.
  • Alzheimer's disease is associated with extensive loss of specific neuronal subpopulations in the brain with memory loss being the most universal symptom.
  • Katzman, R. (1986) New England Journal of Medicine 314:964 ).
  • Alzheimer's disease is well characterized with regard to neuropathological changes. However, abnormalities have been reported in peripheral tissue supporting the possibility that Alzheimer's disease is a systematic disorder with pathology of the central nervous system being the most prominent.
  • Connolly, G., Fibroblast models of neurological disorders: fluorescence measurement studies, Review, TiPS Col. 19, 171-77 (1998 ) For a discussion of Alzheimer's disease links to a genetic origin and chromosomes 1, 14, and 21 see St. George-Hyslop, P.
  • ⁇ -amyloid and tau are proteins most consistently identified in the brains of patients with Alzheimer's disease to play a role in the physiology or pathophysiology of brain.
  • ⁇ -amyloid and tau are proteins most consistently identified in the brains of patients with Alzheimer's disease to play a role in the physiology or pathophysiology of brain.
  • K + and Ca 2+ channels have been demonstrated to play key roles in memory storage and recall.
  • potassium channels have been found to change during memory storage.
  • This observation coupled with the almost universal symptom of memory loss in Alzheimer's patents, led to the investigation of potassium channel function as a possible site of Alzheimer's disease pathology and the effect of PKC modulation on cognition.
  • PKC was identified as one of the largest gene families of non-receptor sereine-threonine protein kinases. Since the discovery of PKC in the early eighties by Nishizuka and coworkers ( Kikkawa et al., J. Biol. Chem., 257, 13341 (1982 ), and its identification as a major receptor of phorbol esters ( Ashendel et al., Cancer Res., 43, 4333 (1983 )), a multitude of physiological signaling mechanisms have been ascribed to this enzyme. The intense interest in PKC stems from its unique ability to be activated in vitro by calcium and diacylglycerol (and its phorbol ester mimetics), an effector whose formation is coupled to phospholipid turnover by the action of growth and differentiation factors.
  • the PKC gene family consists presently of 11 genes which are divided into four subgrounds: 1) classical PKC ⁇ , ⁇ 1 , ⁇ 2 ( ⁇ 1 and ⁇ 2 are alternatively spliced forms of the same gene) and ⁇ , 2) novel PKC ⁇ , ⁇ , ⁇ and ⁇ , 3) atypical PKC ⁇ , ⁇ , ⁇ and ⁇ and 4) PKC ⁇ .
  • PKC ⁇ resembles the novel PKC isoforms but differs by having a putative transmembrane domain (reviewed by Blohe et al., Cancer Metast. Rev. 13, 411 (1994 ); Ilug et al., Biochem j., 291, 329 (1993 ); Kikkawa et al., Ann. Rev. Biochem.
  • the ⁇ , ⁇ 1 , ⁇ 2 , and ⁇ isoforms are Ca 2+ , phospholipid and diacylglycerol-dependent and represent the classical isoforms of PKC, whereas the other isoforms are activated by phospholipid and diacylglycerol but are not dependent on Ca 2+ . All isoforms encompass 5 variable (V1-V5) regions, and the ⁇ , ⁇ , ⁇ isoforms contain four (C1-C4) structural domains which are highly conserved.
  • All isoforms except PKC ⁇ , ⁇ and ⁇ lack the C2 domain, and the ⁇ , ⁇ and isoforms also lack nine of two cysteine-rich zinc finger domains in C1 to which diacylglycerol binds.
  • the C1 domain also contains the pseudosubstrate sequence which is highly conserved among all isoforms, and which serves an autoregulatory function by blocking the substrate-binding site to produce an inactive conformation of the enzyme ( House et al., Science, 238, 1726 (1987 )).
  • PKC isoforms are thought to have highly specialized roles in signal transduction in response to physiological stimuli ( Nishizuka, Cancer, 10, 1892 (1989 )), as well as in neoplastic transformation and differentiation ( Glazer, Protein Kinase C. J.F. Kuo, ed., Oxford U. Press (1994) at pages 171-198 ).
  • PKC modulators see PCT/US97/08141 , U.S. Patent Nos. 5,652,232 ; 6,043,270 ; 6,080,784 ; 5,891,906 ; 5,962,498 ; 5,955,501 ; 5,891,870 and 5,962,504 .
  • PKC has proven to be an exciting target for the modulation of APP processing. It is well established that PKC plays a role in APP processing. Phorbol esters for instance have been shown to significantly increase the relative amount of non-amyloidogenic soluble APP (sAPP) secreted through PKC activation. Activation of PKC by phorbol ester does not appear to result in a direct phosphorylation of the APP molecule, however. Irrespective of the precise site of action, phorbol-induced PKC activation results in an enhanced or favored ⁇ -secretase, non-amyloidogenic pathway.
  • sAPP non-amyloidogenic soluble APP
  • PKC activation is an attractive approach for influencing the production of non-deleterious sAPP and even producing beneficial sAPP and at the same time reduce the relative amount of A ⁇ peptides.
  • Phorbol esters are not suitable compounds for eventual drug development because of their tumor promotion activity. ( Ibarreta, et al., Benzolactam (BL) enhances sAPP secretion in fibroblasts and in PC12 cells, NeuroReport, Vol. 10 No. 5&6, pp 1034-40 (1999 )).
  • PKC isozymes play different, sometimes opposing, roles in biological processes, providing two directions for pharmacological exploitation.
  • One is the design of specific (preferably, isozyme specific) inhibitors of PKC. This approach is complicated by the fact that the catalytic domain is not the domain primarily responsible for the isotype specificity of PKC.
  • the other approach is to develop isozyme-selective, regulatory site-directed PKC activators. These may provide a way to override the effect of other signal transduction pathways with opposite biological effects. Alternatively, by inducing down-regulation of PKC after acute activation, PKC activators may cause long term antagonism. Bryostatin is currently in clinical trials as an anti-cancer agent.
  • the bryostatin are known to bind to the regulatory domain of PKC and to activate the enzyme.
  • Bryostatin is an example of isozyme-selective activators of PKC.
  • Compounds in addition to bryostatins have been found to modulate PKC. (see for example WO 97/43268 )
  • the methods and compositions of the present invention fulfill these needs and will greatly improve the clinical treatment for Alzheimer's disease and other neurodegenerative diseases, as well as, provide for improved cognitive enhancement.
  • the methods and compositions also provide treatment and/or enhancement of the cognitive state through the modulation of ⁇ -secretase.
  • the invention relates to compounds, compositions, and methods for the treatment of conditions associated with enhancement/improvement of cognitive ability.
  • the present invention further relates to compounds, compositions and methods for the treatment of conditions associated with amyloid processing, such as Alzheimer's Disease, which provides for improved/enhanced cognitive ability in the subject treated.
  • the compounds and compositions of the present invention are selected from macrocyclic lactones (i.e. bryostatin and neristatin class).
  • the invention in another aspect relates to macrocyclic lactone compounds, compositions and methods that modulate ⁇ -secretase activity.
  • macrocyclic lactone compounds compositions and methods that modulate ⁇ -secretase activity.
  • bryostatin and neristatin class compounds are of particular interest.
  • bryostatin-1 are of further interest.
  • Another aspect of the invention relates to the bryostatin and neristatin class compounds, as a PKC activator, to alter conditions associated with amyloid processing in order to enhance the ⁇ -secretase pathway to generate soluble ⁇ -amyloid precursor protein ( ⁇ APP) so as to prevent ⁇ -amyloid aggregation and improve/enhance cognitive ability.
  • Such activation for example, can be employed in the treatment of Alzheimer's Disease.
  • bryostatin-1 is particularly interest.
  • the invention in another aspect, relates to a method for treating plaque formation, such as that associated with Alzheimer's Disease, and improving/enhancing the cognitive state of the subject comprising administering to the subject an effective amount of macrocyclic lactone to activate PKC.
  • the PKC activator is of the bryostatin or neristatin class of compounds.
  • the compound is bryostatin-1.
  • compositions for treating plaque formation and improving/enhancing cognitive ability comprising: (i) a macrocyclic lactone in an amount effective to elevate soluble ⁇ -amyloid, generate soluble ⁇ APP and prevent ⁇ -amyloid aggregation; and (ii) a pharmaceutically effective carrier.
  • the composition is used to improve/enhance cognitive ability associated with Alzheimer's Disease.
  • the macrocyclic lactone is preferably selected from the bryostatin or neristatin class compounds, particularly bryostatin-1.
  • the activation of PKC isoenzymes results in improved cognitive abilities.
  • the improved cognitive ability is memory.
  • the improved cognitive ability is learning.
  • the improved cognitive ability is attention.
  • PKC's isoenzymes are activated by a macrocyclic lactone (i.e. bryostatin class and neristatin class).
  • bryostatin-1 through 18 and neristatin is used to activate the PKC isoenzyme.
  • bryostatin-1 is used.
  • the invention comprises a composition of PKC isoenzyme activator administered in a amount effective to improve cognitive abilities.
  • the PKC isoenzyme activator is selected from macrocyclic lactones (i.e. bryostatin class and neristatin class).
  • the amount of PKC activator administered is in an amount effective to increase the production of sAPP.
  • the amount of composition administered does not cause myalgia.
  • the PKC isoenzymes are activated in subjects, which are suffering or have suffered from neurological diseases, strokes or hypoxia. In a more preferred embodiment the PKC isoenzyme is activated in Alzheimer's Disease subjects or models.
  • the PKC activation results in the modulation of amyloid precursor protein metabolism. Further the modulation by the PKC activation results in an increase in the alpha secretase pathway. The alpha secretase pathway results in non-toxic, non-amyloidogenic fragments related to cognitive impairment. As a result the cognitive condition of the subject improves. In another embodiment of the invention the PKC activation reduces the amyloidogenic and toxic fragments Abeta 40 and Ab42.
  • Another embodiment of the invention is a method of improving cognitive ability through the activation of PKC isoenzymes.
  • the PKC activation occurs in "normal" subjects.
  • the PKC activation occurs in subjects suffering from a disease, deteriorating cognitive faculties, or malfunctioning cognition.
  • the method is a method for treating Alzheimer's Disease.
  • the modulation of PKC is through the use of a non-tumor promoting agent resulting in improved cognitive abilities.
  • the PKC activator is selected from bryostatin-1 through bryostatin-18 and neristatin.
  • bryostatin-1 is used.
  • bryostatin-1 is used in combination with a non-bryostatin class compound to improve cognitive ability and reduce side effects.
  • the modulation of PKC through macrocyclic lactones is used in vitro for the testing of conditions associated with Alzheimer's Disease.
  • the in vitro use may include for example, the testing of fibroblast cells, blood cells, or the monitoring of ion channel conductance in cellular models.
  • the compounds and compositions are administered through oral and/or injectable forms including intravenously and intraventricularly.
  • the present invention therefore provides a method of treating impaired memory or a learning disorder in a subject, the method comprising administering thereto a therapeutically effective amount of one of the present compounds.
  • the present compounds can thus be used in the therapeutic treatment of clinical conditions in which memory defects or impaired learning occur. In this way memory and learning can be improved. The condition of the subject can thereby be improved.
  • compositions and methods have utility in treating clinical conditions and disorders in which impaired memory or a learning disorder occurs, either as a central feature or as an associated symptom.
  • Examples such conditions which the present compounds can be used to treat include Alzheimer's disease, multi-infarct dementia and the Lewy-body variant of Alzheimer's disease with or without association with Parkinson's disease; Creutzfeld-Jakob disease and Korsakow's disorder.
  • compositions and methods can also be used to treat impaired memory or learning which is age-associated, is consequent upon electro-convulsive therapy or which is the result of brain damage caused, for example, by stroke, an anesthetic accident, head trauma, hypoglycemia, carbon monoxide poisoning, lithium intoxication or a vitamin deficiency.
  • the compounds have the added advantage of being non-tumor promoting and already being involved in phase II clinical trials.
  • the invention relates to a pharmaceutical composition for enhancing cognition, preventing and/or treating cognition disorders. More particularly, it relates to the pharmaceutical composition comprising macrocyclic lactones (i.e. bryostatin class and neristatin class) and their derivatives as the active ingredient for enhancing cognition, preventing and/or treating cognition disorders.
  • macrocyclic lactones i.e. bryostatin class and neristatin class
  • the pharmaceutical composition comprises macrocyclic lactones, particularly the bryostatin and neristatin class, or a pharmaceutically acceptable salt or derivative thereof, and a pharmaceutically acceptable carrier or excipient.
  • composition according to the invention is useful in the enhancement of cognition, prophylaxis and/or treatment of cognition disorders, wherein cognition disorders include, but are not limited to, disorders of learning acquisition, memory consolidation, and retrieval, as described herein.
  • the invention concerns a method for the treatment of amyloidosis associated with neurological diseases, including Alzheimer's disease by administering to a patient an effective amount of at least one agent that modulates or affects the phosphorylation of proteins in mammalian cells.
  • the invention also provides a method for treating Alzheimer's disease comprising administering to a patient an effective amount of a macrocyclic lactone (i.e. bryostatin class and neristatin class).
  • a macrocyclic lactone i.e. bryostatin class and neristatin class.
  • the bryostatin or neristatin class compounds may be used in the above methods in combination with different phorbol esters to prevent or reduce tumorogentic response in the subject.
  • Memory loss and impaired learning ability are features of a range of clinical conditions. For instance, loss of memory is the most common symptom of dementia states including Alzheimer's disease. Memory defects also occur with other kinds of dementia such as multi-infarct dementia (MID), a senile dementia caused by cerebrovascular deficiency, and the Lewy-body variant of Alzheimer's disease with or without association with Parkinson's disease, or Creutzfeld-Jakob disease. Loss of memory is a common feature of brain-damaged patients.
  • MID multi-infarct dementia
  • senile dementia caused by cerebrovascular deficiency
  • Lewy-body variant of Alzheimer's disease with or without association with Parkinson's disease
  • Creutzfeld-Jakob disease Creutzfeld-Jakob disease. Loss of memory is a common feature of brain-damaged patients.
  • Brain damage may occur, for example, after a classical stroke or as a result of an anesthetic accident, head trauma, hypoglycemia, carbon monoxide poisoning, lithium intoxication, vitamin (B1, thiamine and B12) deficiency, or excessive alcohol use or Kosakow's disorder.
  • Memory impairment may furthermore be age-associated; the ability to recall information such as names, places and words seems to decrease with increase age.
  • Transient memory loss may also occur in patients, suffering from a major depressive disorder, after electro-convulsive therapy (ECT).
  • ECT electro-convulsive therapy
  • Alzheimer's disease is in fact the most important clinical entity responsible for progressive dementia in ageing populations, whereas hypoxia/stroke is responsible for significant memory defects not related to neurological disorders.
  • Alzheimer's disease is characterized by progressive memory impairments, loss of language and visuospatial skills and behavior deficits ( McKhann et al., 1986, Neurology, 34:939-944 ).
  • the cognitive impairment of individuals with Alzheimer's disease is the result of degeneration of neuronal cells located in the cerebral cortex, hippocampus, basal forebrain and other brain regions.
  • Histologic analyzes of Alzheimer's disease brains obtained at autopsy demonstrated the presence of neurofibrillary tangles (NFT) in perikarya and axons of degenerating neurons, extracellular neuritic (senile) plaques, and amyloid plaques inside and around some blood vessels of affected brain regions.
  • NFT neurofibrillary tangles
  • Neurofibrillary tangles are abnormal filamentous structures containing fibers (about 10 nm in diameter) that are paired in a helical fashion, therefore also called paired helical filaments. Neuritic plaques are located at degenerating nerve terminals (both axonal and dendritic), and contain a core compound of amyloid protein fibers. In summary, Alzheimer's disease is characterized by certain neuropathological features including intracellular neurofibrillary tangles, primarily composed of cytoskeletal proteins, and extracellular parenchymal and cerebrosvascular amyloid.
  • AD Alzheimer's disease
  • APP amyloid precursor protein
  • amyloid precursor protein determines the production of fragments that later aggregate forming the amyloid deposits characteristic of Alzheimer's disease (AD), known as senile or AD plaques.
  • AD Alzheimer's disease
  • APP processing is an early and key pathophysiological event in AD.
  • APP processing pathways Three alternative APP processing pathways have been identified.
  • the previously termed "normal" processing involves the participation of an enzyme that cleaves APP within the A ⁇ sequence at residue Lysl6 (or between Lysl6 and Leu17; APP770 nomenclature), resulting in non-amyloidogenic fragments: a large N-terminus ectodomain and a small 9 kDa membrane bound fragment.
  • This enzyme yet to be fully identified, is known as ⁇ -secretase.
  • Two additional secretases participate in APP processing.
  • One alternative pathway involves the cleavage of APP outside the A ⁇ domain, between Met671 and Asp672 (by ⁇ -secretase) and the participation of the endosomal-lysomal system.
  • cultured cells transfected with this mutation or the APP 717 mutation secrete larger amounts of A ⁇ . More recently, carriers of other APP mutations and PS1 and PS2 mutations have been shown to secrete elevated amounts of a particular form, long (42-43 amino acids) A ⁇ .
  • the PKC isoenzymes provides a critical, specific and rate limiting molecular target through which a unique correlation of biochemical, biophysical, and behavioral efficacy can be demonstrated and applied to subjects to improve cognitive ability.
  • PKC protein kinase
  • Alterations in PKC, as well alterations in calcium regulation and potassium (K + ) channels are included among alterations in fibroblasts in Alzheimer's disease (AD) patients.
  • PKC activation has been shown to restore normal K + channel function, as measured by TEA-induced [Ca 2+ ] elevations.
  • Further patch-clamp data substantiates the effect of PKC activators on restoration of 113psK + channel activity.
  • PKC activator-based restoration of K + channels has been established as an approach to the investigation of AD pathophysiology, and provides a useful model for AD therapeutics. (See pending applications 09/652,656 herein incorporated in its entirety.)
  • AD Alzheimer's disease
  • animal neuronal cells peripheral tissues from Alzheimer's disease (AD) patients and animal neuronal cells permitted the identification of a number of cellular/molecular alterations reflecting comparable processes in the AD brain and thus, of pathophysiological relevance (Baker et al., 1988; Scott, 1993; Huang, 1994; Scheuner et al., 1996; Etcheberrigaray & Alkon, 1997; Gasparini et al., 1997). Alteration of potassium channel function has been identified in fibroblasts (Etcheberrigaray et al., 1993) and in blood cells (Bondy et al., 1996) obtained from AD patients.
  • ⁇ -amyloid widely accepted as a major player in AD pathophysiology (Gandy & Greengard, 1994; Selkoe, 1994; Yankner, 1996), was capable of inducing an AD-like K + channel alteration in control fibroblasts (Etcheberrigaray et al., 1994). Similar or comparable effects of ⁇ -amyloid on K + channels have been reported in neurons from laboratory animals (Good et al., 1996; also for a review see Fraser et al., 1997).
  • fibroblasts with known dysfunctional K + channels treated with PKC activators restore channel activity as monitored by the presence/absence of TEA-induced calcium elevations.
  • assays based on tetraethylammonium chloride (TEA)-induced [Ca 2+ ] elevation have been used to show functional 113pS K + channels that are susceptible to TEA blockade (Etcheberrigaray et al., 1993, 1994; Hirashima et al., 1996).
  • TEA tetraethylammonium chloride
  • TEA-induced [Ca 2+ ] elevations and K + channel activity observed in fibroblasts from control individuals are virtually absent in fibroblasts from AD patients (Etcheberrigaray et al., 1993; Hirashima et al., 1996).
  • PKC activators can restore the responsiveness of AD fibroblast cell lines to the TEA challenge.
  • immunoblot evidence from these studies demonstrate that this restoration is related to a preferential participation of the ⁇ isoform.
  • the present inventors have also observed that activation of protein kinase C favors the ⁇ -secretase processing of the Alzheimer's disease (AD) amyloid precursor protein (APP), resulting in the generation of non-amyloidogenic soluble APP (sAPP). Consequently, the relative secretion of amyloidogenic A 1-40 and A 1-42(3) is reduced. This is particularly relevant since fibroblasts and other cells expressing APP and presenilin AD mutations secrete increased amounts of total A ⁇ and/or increased ratios of A 1-42(3) /A 1-40.
  • PKC defects have been found in AD brain ( ⁇ and ⁇ isoforms) and in fibroblasts ( ⁇ -isoform) from AD patients.
  • Synapses are considered a critical site at final targets through which memory-related events realize their functional expression, whether the events involve changed gene expression and protein translation, altered kinase activities, or modified signaling cascades.
  • a few proteins have been implicated in associative memory including Ca 2+ /calmodulin II kinases, protein kinase C, calexcitin, a 22-kDa learning-associated Ca 2+ binding protein, and type II ryanodine receptors.
  • the modulation of PKC through the administration of macrocyclic lactones provides a mechanism to effect synaptic modification.
  • the area of memory and learning impairment is rich in animal models that are able to demonstrate different features of memory and learning processes. (See, for example, Hollister, L.E., 1990, Pharmacopsychiat., 23, (Suppl II) 33-36 ).
  • the available animal models of memory loss and impaired learning involve measuring the ability of animals to remember a discrete event. These tests include the Morris Water Maze and the passive avoidance procedure. In the Morris Water Maze, animals are allowed to swim in a tank divided into four quadrants, only one of which has a safety platform beneath the water. The platform is removed and the animals are tested for how long they search the correct quadrant verse the incorrect quadrants.
  • abnormal is meant to include individuals who have not been diagnosis with or currently display diminished or otherwise impaired cognitive function.
  • the different cognitive abilities may be tested and evaluated through known means well established in the art, including but not limited to tests from basic motor-spatial skills to more complex memory recall testing.
  • tests used for cognitive ability for non-primates include the Morris Water Maze, Radial Maze, T Maze, Eye Blink Conditioning, Delayed Recall, and Cued Recall while for primate subjects test may include Eye Blink, Delayed Recall, Cued Recall, Face Recognition, Minimental, and ADAS-Cog. Many of these tests are typically used in the mental state assessment for patients suffering from AD. Similarly, the evaluation for animal models for similar purposes with well describe in the literature.
  • bryostatin class and neristatin class macrocyclic lactones
  • bryostatin-1 has been shown to activate PKC and proven to be devoid of tumor promotion activity.
  • Bryostatin-1 as a PKC activator, is also particularly useful since the dose response curve of bryostatin-1 is biphasic.
  • bryostatin-1 demonstrates differential regulation of PKC isozymes, including PKC ⁇ , PKC ⁇ , and PKC ⁇ .
  • Bryostatin-1 has undergone toxicity and safety studies in animals and humans and is actively being investigated as an anti-cancer agent.
  • Bryostatin-1's use in the studies has determined that the main adverse reaction in humans is myalgia, limiting the maximum dose to 40 mg/m 2 .
  • the present invention has utilized concentrations of 0.1 nM of bryostatin-1 to cause a dramatic increase of sAPP secretion.
  • Bryostatin-1 has been compared to a vehicle alone and to another PKC activator, benzolactam (BL), used at a concentration 10,000 times higher. Also bryostatin used at 0.01 nM still proved effective to increase sAPP secretion. (See Figure 1 ).
  • PKC translocation shows that a measure of activation is maximal at 30 min, followed by a partial decline, which remains higher than basal translocation levels up to six hours.
  • Macrocyclic lactones, and particularly bryostatin-1 is described in U.S. Patent 4,560,774 .
  • Macrocyclic lactones and their derivatives are described elsewhere in the art for instance in U.S. Patent 6,187,568 , U.S. Patent 6,043,270 , U.S. Patent 5,393,897 , U.S. Patent 5,072,004 , U.S. Patent 5,196,447 , U.S. Patent 4,833,257 , and U.S. Patent 4,611,066 .
  • the above patents describe various compounds and various uses for macrocyclic lactones including their use as an antiinflammatory or anti-tumor agent.
  • bryostatin class compounds can be found in: Differential Regulation of Protein Kinase C Isozymes by Bryostatin 1 and Phorbol 12-Myristate 13-Acetate in NIH 3T3 Fibroblasts, Szallasi et al., Journal of Biological Chemistry, Vol. 269, No. 3, pp.
  • Bryostatin 1 an Activator of Protein Kinase C, Zhang et al., Cancer Research 56, 802-808 (1996 ); Bryostatin 1, an activator of protein kinase C, inhibits tumor promotion by phorbol esters in SENCAR mouse skin, Hennings et al., Carcinogenesis vol. 8, no. 9, pp 1343-46 (1987 ); Phase II Trial of Bryostatin 1 in Patients with Relapse Low-Grade Non-Hodgkin's Lymphoma and Chronic Lymphocytic Leukemia, Varterasian et al., Clinical Cancer Research, Vol. 6, pp. 825-28 (2000 ); and Review Article: Chemistry and Clinical Biology of the Bryostatins, Mutter et al., Bioorganic & Medicinal Chemistry 8, pp. 1841-1860 (2000 ),
  • Macrocyclic lactones including the bryostatin class, represent known compounds, originally derived from Bigula neritina L. While multiple uses for macrocyclic lactones, particularly the bryostatin class are known, the relationship between macrocyclic lactones and cognition enhancement was previously unknown.
  • the examples of the compounds that may be used in the present invention include macrocyclic lactones (i.e. bryostatin class and neristatin class compounds). While specific embodiments of these compounds are described in the examples and detailed description, it should be understood that the compounds disclosed in the references and derivatives thereof could also be used for the present compositions and methods.
  • macrocyclic lactones i.e. bryostatin class and neristatin class compounds. While specific embodiments of these compounds are described in the examples and detailed description, it should be understood that the compounds disclosed in the references and derivatives thereof could also be used for the present compositions and methods.
  • macrocyclic lactone compounds and their derivatives are amenable to combinatorial synthetic techniques and thus libraries of the compounds can be generated to optimize pharmacological parameters, including, but not limited to efficacy and safety of the compositions. Additionally, these libraries can be assayed to determine those members that preferably modulate ⁇ -secretase and/or PKC.
  • Combinatorial libraries high throughput screening of natural products and fermentation broths has resulted in the discovery of several new drugs.
  • generation and screening of chemical diversity is being utilized extensively as a major technique for the discovery of lead compounds, and this is certainly a major fundamental advance in the area of drug discovery.
  • combinatorial techniques provide for a valuable tool for the optimization of desired biological activity.
  • the subject reactions readily lend themselves to the creation of combinatorial libraries of compounds for the screening of pharmaceutical, or other biological or medically-related activity or material-related qualities.
  • a combinatorial library for the purposes of the present invention is a mixture of chemically related compounds, which may be screened together for a desired property; said libraries may be in solution or covalently linked to a solid support.
  • the preparation of many related compounds in a single reaction greatly reduces and simplifies the number of screening processes that need to be carried out. Screening for the appropriate biological property may be done by conventional methods.
  • the present invention also provides methods for determining the ability of one or more inventive compounds to bind to effectively modulate ⁇ -secretase and/or PKC.
  • the present compounds can be administered by a variety of routes and in a variety of dosage forms including those for oral, rectal, parenteral (such as subcutaneous, intramuscular and intravenous), epidural, intrathecal, intra-articular, topical and boccal administration.
  • parenteral such as subcutaneous, intramuscular and intravenous
  • epidural such as subcutaneous, intramuscular and intravenous
  • intrathecal such as intrathecal
  • intra-articular intra-articular
  • topical and boccal administration a variety of dosage forms
  • the dose range for adult human beings will depend on a number of factors including the age, weight and condition of the patient and the administration route.
  • fine powders or granules containing diluting, dispersing and/or surface-active agents may be presented in a draught, in water or a syrup, in capsules or sachets in the dry state, in a non-aqueous suspension wherein suspending agents may be included, or in a suspension in water or a syrup.
  • suspending agents may be included, or in a suspension in water or a syrup.
  • flavouring, preserving, suspending, thickening or emulsifying agents can be included.
  • Other compounds which may be included by admixture are, for example, medically inert ingredients, e.g. solid and liquid diluent, such as lactose, dextrose, saccharose, cellulose, starch or calcium phosphate for tablets or capsules, olive oil or ethyl oleate for soft capsules and water or vegetable oil for suspensions or emulsions; lubricating agents such as silica, talc, stearic acid, magnesium or calcium stearate and/or polyethylene glycols; gelling agents such as colloidal clays; thickening agents such as gum tragacanth or sodium alginate, binding agents such as starches, Arabic gums, gelatin, methylcellulose, carboxymethylcellulose or polyvinylpyrrolidone; disintegrating agents such as starch, alginic acid, alginates or sodium starch glycolate; effervescing mixtures; dyestuff; sweeteners; wetting agents such as lecithin, polysorbates or
  • Liquid dispersions for oral administration may be syrups, emulsions or suspensions.
  • the syrups may contain as carrier, for example, saccharose or saccharose with glycerol and/or mannitol and/or sorbitol.
  • a syrup for diabetic patient can contain as carriers only products, for example sorbitol, which do not metabolize to glucose or which metabolize only a very small amount to glucose.
  • the suspensions and the emulsions may contain a carrier, for example a natural gum, agar, sodium alginate, pectin, methylcellulose, carboxymethylcellulose or polyvinyl alcohol.
  • Suspension or solutions for intramuscular injection may contain, together with the active compound, a pharmaceutically acceptable carrier such as sterile water, olive oil, ethyl oleate, glycols such as propylene glycol and, if desired, a suitable amount of lidocaine hydrochloride.
  • Solutions for intravenous injection or infusion may contain a carrier, for example, sterile water that is generally Water for Injection. Preferably, however, they may take the form of a sterile, aqueous, isotonic saline solution.
  • the present compounds may be encapsulated within liposomes. The present compounds may also utilize other known active agent delivery systems.
  • the present compounds may also be administered in pure form unassociated with other additives, in which case a capsule, sachet or tablet is the preferred dosage form.
  • Tablets and other forms of presentation provided in discrete units conveniently contain a daily dose, or an appropriate fraction thereof, of one of the present compounds.
  • units may contain from 5 mg to 500 mg, but more usually from 10 mg to 250 mg, of one of the present compounds.
  • compositions of the invention can be demonstrated using standard pharmacological models that are known in the art.
  • inventive compositions can be incorporated or encapsulated in a suitable polymer matrix or membrane for site-specific delivery, or can be functionalized with specific targeting agents, capable of effecting site specific delivery. These techniques, as well as other drug delivery techniques are well known in the art.
  • Cultured skin fibroblasts were obtained from the Coriell Cell Repositories and grown using the general guidelines established for their culture with slight modifications (Cristofalo & Carptentier, 1988; Hirashima et al., 1996).
  • the culture medium in which cells were grown was Dulbecco's modified Eagle's medium (GIBCO) supplemented with 10% calf serum (Biofluids, Inc.).
  • Fibroblasts from control cell lines (AC), cases AG07141 and AG06241, and a familial AD (FAD) case (AG06848) were utilized.
  • the pellets were re-suspended in the following homogenization buffer: 20 mM Tris-HCl, pH 7.5, 2 mM EDTA, 2mM EGTA, 5 mM DTT, 0.32 M sucrose, and protease inhibitor cocktail (Sigma). Hemogenates were obtained by sonication, and centrifuged at ⁇ 12,00g for 20 minutes, and the supernatants were used as the cytosolic fraction. The pellets were homogenized in the same buffer containing 1.0% Triton X-100, incubated in ice for 45 minutes, and centrifuged at ⁇ 12,000g for 20 minutes. The supernatant from this batch was used as the membranous fraction.
  • the concentration of secreted APP was measured using conventional immunoblotting techniques, with minor modifications the protocol. Precipitated protein extracts each dish/treatment were loaded to freshly prepared 10% acrylamide Tris HCl minigels and separated SDPAGE. The volume of sample loaded was corrected for total cell protein per dish. Proteins were then electrophoretically transferred to PVDF membranes. Membranes were saturated with 5% non-fat dry milk to block non-specific binding. Blocked membranes were incubated overnight at 4°C with the commercially available antibody 6E10 (1:500), which recognizes sAPP-alpha in the conditioned medium (SENETEK).
  • Bryostatin-1 elicits a powerful response, demonstrating the activation of PKC. It should be noted the activation of PKC is easily detectable 30 minutes after delivery, following a dose of only 0.1 nM of bryostatin-1.
  • AD cell lines exhibit both defective PKC and impaired sAPP secretion (Bergamaschi et al., 1995; Govoni et al., 1996).
  • ⁇ -amyloid has been shown to induce an AD-like K + channel defect in fibroblasts (Etcheberrigaray et al., 1994) and to block K + currents in cultured neurons (Good et al., 1996). Therefore, we suggest a mechanistic link such that an isozyme-specific PKC defect may lead to abnormal APP processing that, among other possible deleterious effects, alters K + channel function.
  • Recent preliminary data also suggest that, perhaps in a vicious cyclical manner, ⁇ -amyloid in turn causes reductions of PKC (Favit et al., 1997).
  • Bryostatin is capable of being used at concentrations to improve cognition that are 300 to 300,000 times lower than the concentration used to treat tumors.
  • the above example further shows that cognitive ability can be improved in non-diseased subjects as compared to other non-diseased subjects through the administration of bryostatin-1.
  • PKC activators particularly byrostatin-1
  • phase II studies for AD treatment/cognitive enhancement could be expedited.
  • bryostatin-1's lipophilic nature provides increased blood brain barrier transport.
  • the present invention would allow for intravenous, oral, intraventricullar, and other known methods for administration.

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US20030171356A1 (en) 2003-09-11
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US6825229B2 (en) 2004-11-30
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US20050037984A1 (en) 2005-02-17
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